| Project/Area Number |
06555207
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Structural/Functional materials
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
NISHIMURA Arata National Institute for Fusion Science, Associate Professor, 大型ヘリカル研究部, 助教授 (60156099)
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| Co-Investigator(Kenkyū-buntansha) |
TAMURA Hitoshi National Institute for Fusion Science, Research Associate, 大型ヘリカル研究部, 助手 (20236756)
IMAGAWA Shinsaku National Institute for Fusion Science, Research Associate, 大型ヘリカル研究部, 助手 (10232604)
MITO Toshiyuki National Institute for Fusion Science, Associate Professor, 大型ヘリカル研究部, 助教授 (10166069)
SATOH Sadao National Institute for Fusion Science, Professor, 大型ヘリカル研究部, 教授 (20235344)
YAMAMOTO Junya National Institute for Fusion Science, Professor, 大型ヘリカル研究部, 教授 (00029208)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥18,200,000 (Direct Cost: ¥18,200,000)
Fiscal Year 1995: ¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1994: ¥11,000,000 (Direct Cost: ¥11,000,000)
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| Keywords | Large scale superconductors / High magnetic field / Cryogenic temperature / Mechanical test / Large current / Stability / Mechanical deformation / 超伝導導体 |
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| Research Abstract |
Large scale plasma devices, such as the Large Helical Device, the Wenderstein 7-X and the International Thermo-nuclear Experimental Reactor, have been planed and started to fabrication. These large devices require the large scale superconducting magnet to generate high magnetic fields. Since huge electro-magnetic forces will act on the superconducting magnet during the operation, the mechanical deformation behavior must estimate before fabrication. For this purpose, the several kinds of measurements for the deformation evaluation have been carried out in this study.
1.NbTi superconductor which had a copper ratio of 1.0 to 2.0, was deformed locally at room temperature, and then was cooled into liquid helium. In this case, a recovery after quenching was delayd because of the increase of an electrical resistance of copper. On the other hand, when the superconductor was deformed at cryogenic temperature, the recovery occurred in a normal way. From these results, it was recognized that the changes of the electric property of a stabilizer were affected by the mechanical deformation and it should be noted on the magnet design and fabrication.
2.The superconductors which was used for the Large Helical Device had a rather stability to mechanical deformation. The coil deformation would be estimated by the mechanical test using a coil pack.
3.An excitation test of Inner Vertical coil of the Large Helical Device was carried out, and the deformation during cooling period and excitation test was measured successfully. In the deformation measurement, cable wires should be considered not to be affected by magnetic field.
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